#include <iostream>
using namespace std;
int main()
{
    int N,x,c;
    cin>>N;
    c=0;
    while(N!=0)
    {
        x=N%2;
        if(x==1)
        {
            c++;
        }
        N=N/2;
    }
    cout<<c;
    return 0;
}